Ontario Lacus
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Ontario Lacus is a dark feature near the south pole of Saturn's moon Titan. Its name implies that it is a lake, but this is only speculation, and it may instead be a plain. It is named after Lake Ontario in North America, with which it shares a similar size and shape.
The existence of seas or lakes of liquid methane was once suspected on Titan's surface, but observations by the Cassini-Huygens mission indicate that Titan is probably dry, at least at present. However, two regions at the south pole, which appears to be smothered by clouds, have been suggested as possible exceptions to the rule. One of these is Ontario Lacus, which has sharply defined boundaries and is very dark in coloration, thus making it seem different from other so-called seas that have now been revealed as plains. However, there is no conclusive evidence yet.
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